连续或分立的贵金属纳米结构可以产生表面等离子共振，在纳米尺度下对光进行调制和传导，被广泛应用于集成光子器件和传感器上，是当前的研究热点。本项目主要进行如下研究：1）研究金属纳米结构的局域表面等离子共振的机理，探索如何增强光场的局域强度，而增强光学非线性效应，如Raman 散射；2）研究金属颗粒的局域表面等离子共振和其他微结构谐振（如光栅衍射）的相互作用，增强在金属颗粒表面的光场局域强度，从而实现单分子Raman散射探测，应用到痕量有毒物质等的探测上；3) 研究金属颗粒对或链的间距在亚纳米到10纳米尺度上变化时的光学效应，探索其在非线性研究上的应用；4）探索微纳结构的制备工艺和技术原理，制备出各种微纳结构，以验证相应的理论研究，并应用到实际的检测上。本项目的研究将对单分子检测的Raman散射技术和高次谐波研究有促进作用，发展的纳米制备技术将促进表面等离激元的实验研究。

Isolated and continuous metallic nanostructures can localize, guide, modulate light in a nanoscale spatial region by the excitation of surface plasmons (SPs). These nanostructures have many application in integrated optics and sensing. In this proposal, we will carry on the following researches: 1) the mechanism of the localized surface plasmon resonances in some novel metal nanostructures will be studied, in order to maximize the localized electromagnetic field at the metal structure and enhance the optical nonlinear effect such as Raman scattering; 2) The interaction of localized surface plasmon resonances in metal nanoparticles and resonances in other dielectric structures (such as gratings) will be fully studied, to further enhance the localized electromagnetic field on the surface of particles, and to realize single molecular detection through Raman scattering for the application of sensing tracing harmful materials；3）The optical property of the metal nanoparticles dimer or chain will be experimentally studied when their distance tuned from sub-nanometer to 10 nanometers, which will be found wide applications in nonlinear optics. 4) We will also develop novel nanotechnologies to fabricate various metal nanostructures which can be used to confirm our design and then for sensing. The finish of this project will be valuable for the single molecular detection based on Raman Scattering, high harmonic generation as well as the research of surface plasmon polaritons.